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Anaerobic bacteria can be detected at population levels of 1011 organisms per g of cecum or colon in adult mice from four different colonies widely spaced in the United States. Most of these microorganisms are oxygen-intolerant fusiform-shaped bacteria. At least one type of these tapered, rod-shaped bacteria can be seen in layers in the epithelial mucin in frozen-section histological preparations of the large bowels of mice. In addition, such microorganisms can be seen within 0.5 μm of the epithelium in ultrathin sections of colon or cecum examined in an electron microscope. These fusiform-shaped bacteria predominate in the mucin layers. However, spiral-shaped microorganisms can be found as well near the mucosal epithelia in ultrathin sections of colon. Also, such organisms can be seen in negatively-stained preparations of washings of the colonic mucosal epithelia examined in an electron microscope. At least three types of spiral-shaped organisms, including both spiral-shaped bacteria and spirochetes, can be found in preparations from mice from three of the four colonies. Such spiral-shaped microorganisms can be detected at population levels as great as 109 organisms per g of cecum or colon in anaerobic cultures of the large bowels of mice from all four colonies. One anaerobic spiral bacterium was isolated in pure culture. This particular organism was found by immunofluorescence to be intermingled with the fusiform-shaped bacteria in the mucin on the mucosal epithelium in the mouse large bowel.

Anaerobic Bacteria on the Mucosal Epithelium of the Murine Large Bowel